\Header{bdf}{Language scores}
\keyword{datasets}{bdf}
\begin{Description}\relax
The \code{bdf} data frame has 2287 rows and 25 columns of language
scores from grade 8 pupils in elementary schools in The Netherlands.\end{Description}
\begin{Usage}
\begin{verbatim}data(bdf)\end{verbatim}
\end{Usage}
\begin{Format}\relax
\describe{
\item[schoolNR] a factor denoting the school.
\item[pupilNR] a factor denoting the pupil.
\item[IQ.verb] a numeric vector of verbal IQ scores
\item[IQ.perf] a numeric vector of IQ scores.
\item[sex] Sex of the student.
\item[Minority] a factor indicating if the student is a member of a
minority group.
\item[repeatgr] an ordered factor indicating if one or more grades
have been repeated.
\item[aritPRET] a numeric vector
\item[classNR] a numeric vector
\item[aritPOST] a numeric vector
\item[langPRET] a numeric vector
\item[langPOST] a numeric vector
\item[ses] a numeric vector of socioeconomic status indicators.
\item[denomina] a factor indicating of the school is a public
school, a Protestant private school, a Catholic private school, or
a non-denominational private school.
\item[schoolSES] a numeric vector
\item[satiprin] a numeric vector
\item[natitest] a factor with levels \code{0} and \code{1}
\item[meetings] a numeric vector
\item[currmeet] a numeric vector
\item[mixedgra] a factor indicating if the class is a mixed-grade class.
\item[percmino] a numeric vector
\item[aritdiff] a numeric vector
\item[homework] a numeric vector
\item[classsiz] a numeric vector
\item[groupsiz] a numeric vector
}\end{Format}
\begin{Source}\relax
\url{http://stat.gamma.rug.nl/snijders/multilevel.htm}\end{Source}
\begin{References}\relax
Snijders, Tom and Bosker, Roel (1999), \emph{Multilevel Analysis: An
Introduction to Basic and Advanced Multilevel Modeling}, Sage.\end{References}
\begin{Examples}
\begin{ExampleCode}
data(bdf)
summary(bdf)
\end{ExampleCode}
\end{Examples}

